Chiang Mai in Summer

In summer (June, July and August), Chiang Mai sees average daytime highs around 32°C and overnight lows near 25°C, with 531 mm of rain over about 65 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.

Over the season highs ease from about 34°C in early June to 31°C by late August. The sky is clear or mostly clear about 2% of the time across summer, and the air most often feels oppressive.

Summer is Chiang Mai's 3rd-best season to visit on our travel score. For the whole year in context, see Chiang Mai's year-round climate.

Avg daytime high: 32°C; 2nd-warmest season
Avg overnight low: 25°C
Rainfall: 531 mm; 65 wet days
Avg wind: 5 km/h
Travel score: 2.6; 3rd-best season
Months: Jun · Jul · Aug

← Spring Chiang Mai year-round climate Fall →

Spring Summer Fall Winter

Temperature in Chiang Mai in Summer

Average highAverage lowShaded bands: 10–90% of days

Over the season highs ease from about 34°C in early June to 31°C by late August.

A typical summer day in Chiang Mai reaches about 32°C and drops to 25°C overnight. The warmest of the three months is June, the coolest August.

How summer really feels in Chiang Mai

Once humidity and wind are folded in, summer brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Chiang Mai weather by month

How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	30° / 15°	7	1.3	11	6.7
Feb	33° / 17°	3	0.7	11.4	5.0
Mar	35° / 20°	12	2.1	11.9	3.1
Apr	37° / 24°	26	4.4	12.4	1.9
May	35° / 25°	99	13.2	12.9	2.3
Jun	33° / 25°	120	18.3	13.1	2.5
Jul	32° / 25°	175	21.9	13	2.6
Aug	31° / 25°	236	25.1	12.6	2.7
Sep	31° / 24°	227	23.4	12.1	2.8
Oct	31° / 22°	114	15.7	11.6	4.0
Nov	30° / 19°	21	4	11.1	5.8
Dec	29° / 16°	9	1.2	10.9	7.2

Cloud cover in Summer

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time across summer.

Chance of precipitation in Summer

Any precipitation

Chiang Mai gets around 531 mm of rain over 65 wet days across summer. The line is the day-by-day chance of measurable precipitation.

Humidity in Summer

DryComfortableHumidMuggyOppressiveMiserable

Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

Wind in Summer

Winds average 5 km/h across summer.

Sunrise & sunset in Summer

DaylightNight

Daylight runs from about 13 hours in early June to 12 h 24 min by late August. The lit band spans sunrise to sunset each day.

Solar energy in Summer

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day across summer, about 4.2 kWh/m².

Planning a trip in summer

Hazard calendar for Chiang Mai

In seasonPeak

In summer, Chiang Mai overlaps its monsoon season. The full year is below, with each hazard's peak months called out.

Chiang Mai's monsoon runs June–October, when most of the year's rain falls.

Monsoon

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is summer a good time to visit Chiang Mai?

Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.

2.6

Sightseeing

3rd-best month of the year

4.3

Beach & pool

4th-best month of the year

summer is a weaker month for outdoor sightseeing in Chiang Mai.

What to pack for Chiang Mai in Summer

From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In summer, Chiang Mai sees daytime highs around 32°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 65 days see rain.

light clothesrain gearsun protection

UV index in Chiang Mai in Summer

LowModerateHighVery highExtreme

Clear-sky midday UV across summer averages around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Chiang Mai peaks around August 13 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 7 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	7	9	9	10	12	13	13	14	12	10	8	7
Level	Very high	Very high	Very high	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high

	UV index (midday)	Level
Jan	7	Very high
Feb	9	Very high
Mar	9	Very high
Apr	10	Very high
May	12	Extreme
Jun	13	Extreme
Jul	13	Extreme
Aug	14	Extreme
Sep	12	Extreme
Oct	10	Extreme
Nov	8	Very high
Dec	7	Very high

Air quality in Chiang Mai in Summer

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.

Air quality in Chiang Mai is worst in March — around 69 µg/m³ PM2.5 (unhealthy), about 4.3× the cleanest month (July, 16 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Chiang Mai's WHO annual average of 33 µg/m³.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	37	46	69	60	28	16	16	17	21	25	28	32
Level	Poor	Poor	Unhealthy	Unhealthy	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	37	Poor
Feb	46	Poor
Mar	69	Unhealthy
Apr	60	Unhealthy
May	28	Moderate
Jun	16	Moderate
Jul	16	Moderate
Aug	17	Moderate
Sep	21	Moderate
Oct	25	Moderate
Nov	28	Moderate
Dec	32	Moderate

Location & terrain

Where is Chiang Mai?

Chiang Mai sits at 18.8°N, 99.0°E, 313 m above sea level, in Thailand. The nearest listed city is Hang Dong, 13 km away.

Topography around Chiang Mai

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Chiang Mai.

Within 3 km, the terrain around Chiang Mai has only modest variations in elevation — a maximum elevation change of 45 m around an average of 313 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,399 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,341 m.

The land around Chiang Mai is covered by artificial surfaces (72%) and trees (22%) within 3 km, trees (57%) and artificial surfaces (21%) within 16 km, and trees (84%) within 80 km.

3 km

45 m

artificial surfaces 72%

16 km

1,399 m

trees 57%

80 km

2,341 m

trees 84%

treesgrasslandcroplandartificial surfaceswater

← Spring Chiang Mai year-round climate Fall →

Summer weather nearby: Hang Dong 13 km · San Kamphaeng 15 km · San Pa Tong 20 km · Lamphun 23 km · Pa Sang 30 km · Lampang 77 km · Pai 86 km · Phayao 104 km

Thailand travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type A / B / C; 230 V · 50 Hz
Prices: ≈ 31% of US; price level, 2025
GDP per capita: $8,057; 2025
Happiness: 6.3 / 10; World Happiness, 2025
Homicide rate: 4.8; per 100k, 2011
Road deaths: 32.2; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Very low; EF EPI 402
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Chiang Mai (18.7904°, 98.9847°, elevation 313 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.